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On heating anhydrous Na2CO3.........is evolved:
  • a)
    CO2
  • b)
    Water vapour
  • c)
    CO
  • d)
    No gas
Correct answer is option 'A'. Can you explain this answer?
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On heating anhydrous Na2CO3.........is evolved:a)CO2b)Water vapourc)CO...
Answer:

When anhydrous sodium carbonate (Na2CO3) is heated, it undergoes a decomposition reaction resulting in the evolution of carbon dioxide gas (CO2). This can be explained as follows:

Decomposition reaction:
When anhydrous sodium carbonate is heated, it decomposes into its constituent elements, sodium oxide (Na2O) and carbon dioxide gas (CO2).

The chemical equation for this reaction can be represented as follows:
Na2CO3(s) → Na2O(s) + CO2(g)

Explanation:
Heating anhydrous sodium carbonate causes the release of carbon dioxide gas due to the breakdown of the carbonate ion (CO3^2-) in the compound.

Key points:
- Anhydrous sodium carbonate is the dehydrated form of sodium carbonate, which means it does not contain any water molecules.
- The decomposition of anhydrous sodium carbonate is an example of a thermal decomposition reaction, where a compound breaks down into simpler substances upon heating.
- The decomposition of anhydrous sodium carbonate is an endothermic reaction, meaning it requires an input of heat energy to occur.
- The release of carbon dioxide gas during the decomposition reaction can be observed by the effervescence or bubbling of gas from the heated compound.
- The evolution of carbon dioxide gas is a characteristic property of sodium carbonate and can be used as a test to confirm the presence of carbonate ions in a compound.
- The evolved carbon dioxide gas can be identified using various tests, such as the limewater test, which turns milky when carbon dioxide is passed through it, indicating the presence of the gas.

Conclusion:
On heating anhydrous sodium carbonate, carbon dioxide gas is evolved due to its decomposition into sodium oxide and carbon dioxide. This reaction is commonly observed in the laboratory and has several applications in industries such as baking, glass manufacturing, and water treatment.
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On heating anhydrous Na2CO3.........is evolved:a)CO2b)Water vapourc)CO...
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